For the tomato 'smashing' job I use a food mill. Mine is only cheap plastic with some metal parts but I would advise anyone to invest in one that has more metal and less plastic which is more difficult to clean.
Example of food mill.
http://www.williams-sonoma.com...
If you have something like a KitchenAid mixer there are food mill attachments available that will remove both the skins and seeds.
I should mention that my mom did not remove the seeds...that was my job. I had to gently squeeze each tomato so most of the seeds would fall into a bowl or I would coax the seeds out with a small spoon. Later I used a sieve to retrieve the liquid and the seeds were saved for next year. (We learned about seed-saving from an old Italian woman - she spoke no English but that didn't stop her from teaching us.
)
I usually follow what my mom taught me (after my dad taught her); drop the clean tomatoes in boiling water for a short time - 30 to 40 seconds - then into ice water - the peels almost fall off on their own. The peels go into the compost bin.
It is possible to utilize a blender but if you are too aggressive you will end up with more tomato sauce than tomatoes.
The tried and true go-to place is the Ball Blue Book. (Online at FreshPreserving,com or buy the books.)
The canning basics for tomatoes are covered in this video.
https://www.youtube.com/watch?...
Good luck and happy harvesting!
